Update release.schema to work with Dgraph v1.1.1.
Update release.schema to work with Dgraph v1.1.1.

In v1.1.1 setting the release.schema returns this error:

    {"errors":[{"message":"Schema does not contain a matching predicate for field apple_movietrailer_id in type Film","extensions":{"code":"Error"}}]}$

All the predicates used as a type field must have a schema entry before it can
be used for a type.

* Add schema entries for all predicates
* Remove type declarations for type fields.

dgraph-io/benchmarks,dgraph-io/benchmarks,dgraph-io/benchmarks